Yes, it's on purpose. The nose skins, being U-shaped, are like a spring -- wanting to pull apart at the edges. By placing a slight bend on those edges it will help them lay flat against the underlying top and bottoms skins after riveting. Otherwise there's a tendency for the nose skins to sit "proud" of the other skins creating a gap. Not the end of the world, but not aesthetically pleasing. The trailing edges of the top and bottom skins being flat don't have the same issue.
RV-10 N728TT - Flying!